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(12) Patent Application Publication (10) Pub. No.: US 2006/0183866A1 Pohl Et Al

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(12) Patent Application Publication (10) Pub. No.: US 2006/0183866A1 Pohl Et Al US 2006O183866A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2006/0183866A1 Pohl et al. (43) Pub. Date: Aug. 17, 2006 (54) BLOCKED MERCAPTOSILANE COUPLING (60) Provisional application No. 60/056,566, filed on Aug. AGENTS FOR FILLED RUBBERS 21, 1997. (76) Inventors: Eric R. Pohl, Mount Kisco, NY (US); Publication Classification Richard W. Cruse, Yorktown Heights, NY (US); Keith J. Weller, North (51) Int. Cl. Greenbush, NY (US); Robert J. CSF I32/00 (2006.01) Pickwell, Tonawanda, NY (US) (52) U.S. Cl. ...................... 525/326.1; 524/146; 524/167; 524/168; 524/173; 524/262: Correspondence Address: 524/265; 524/267: 524/302: DILWORTH & BARRESE, LLP 524/306; 524/307; 524/308; 333 EARLE OVINGTON BLVD. 524/309; 524/311:524/392: UNIONDALE, NY 11553 (US) 524/393; 524/401 (21) Appl. No.: 11/398,125 (57) ABSTRACT (22) Filed: Apr. 5, 2006 Blocked mercaptosilanes are provided in which the blocking Related U.S. Application Data group contains an unsaturated heteroatom or carbon chemi cally bound directly to sulfur via a single bond. This (60) Continuation of application No. 09/986,512, filed on blocking group optionally may be substituted with one or Nov. 9, 2001, which is a division of application No. more carboxylate ester or carboxylic acid functional groups. 09/284.841, filed on Apr. 21, 1999, now Pat. No. These silanes are used in manufacture of inorganic filled 6,414,061, filed as 371 of international application rubbers, with the silanes deblocked by a deblocking agent. No. PCT/US98/17391, filed on Aug. 21, 1998. Synthesis of the blocked mercaptosilanes is also provided. US 2006/0183866 A1 Aug. 17, 2006 BLOCKED MERCAPTOSILANE COUPLNG mercaptosilane coupling agents, nor does it disclose or AGENTS FOR FILLED RUBBERS Suggest the use of these compounds in any way which would give rise to the advantages of using them as a Source of latent CROSS REFERENCE TO RELATED mercaptosilane. APPLICATION 0006 U.S. Pat. Nos. 4,519,430 to Ahmad et al. and U.S. 0001. This is a continuation of co-pending application no. Pat. No. 4,184,998 to Shippy et al. disclose the blocking of 09/986,512 filed on Nov. 9 2001, which is a division of a mercaptosilane with an isocyanate to form a solid which is application Ser. No. 09/284.841, filed Apr. 21, 1999, now added to a tire composition, which mercaptain reacts into the U.S. Pat. No. 6,414,061 issued on Jul. 2, 2002, which is a tire during heating, which could happen at any time during 371 of PCT/US98/17391, Aug. 21, 1998, which claims processing since this is a thermal mechanism. The purpose priority to U.S. Provisional Patent Application No. 60/056, of this silane is to avoid the sulfur smell of the mercaptosi 566, filed Aug. 21, 1997. lane, not to improve the processing of the tire. Moreover, the isocyanate used has toxicity issues when used to make the FIELD OF THE INVENTION silane and when released during rubber processing. 0002 This invention relates to sulfur silane coupling 0007 U.S. Pat. No. 3,957,718 to Porchet et al. discloses agents which are latent, that is, they are in a state of reduced compositions containing silica, phenoplasts or aminoplasts, activity until Such a time as one finds it useful to activate and silanes, such as Xanthates, thioxanthates, and dithiocar them. The invention also relates to the manufacture of bamates; however, the prior art does not disclose or Suggest rubbers including inorganic fillers and these silane coupling the use of these silanes as latent mercaptosilane coupling agents, as well as to the manufacture of the silanes. agents, nor does it suggest or disclose the advantage of using them as a source of latent mercaptosilane. There remains a BACKGROUND need for effective latent coupling agents which exhibit the 0003. The majority of art in the use of sulfur-containing advantages of mercaptosilanes without exhibiting the dis coupling agents in rubber involves silanes containing one or advantages Such as described herein. more of the following chemical bond types: S-H (mer capto), S S (disulfide or polysulfide), or C=S (thiocarbo SUMMARY OF THE INVENTION nyl). Mercaptosilanes have offered Superior coupling at 0008. The silanes of the present invention are mercap substantially reduced loadings; however, their high chemical tosilane derivatives in which the mercapto group is blocked reactivity with organic polymers leads to unacceptably high ("blocked mercaptosilanes'), i.e., the mercapto hydrogen Viscosities during processing and premature curing (Scorch). atom is replaced by another group (hereafter referred to as Their undesirability is aggravated by their odor. As a result, “blocking group'). Specifically, the silanes of the present other, less reactive coupling agents have been found. Hence, invention are blocked mercaptosilanes in which the blocking a compromise must be found between coupling and the group contains an unsaturated heteroatom or carbon chemi associated final properties, processability, and required load cally bound directly to sulfur via a single bond. This ing levels, which invariably leads to the need to use sub blocking group optionally may be substituted with one or stantially higher coupling agent loadings than would be more carboxylate ester or carboxylic acid functional groups. required with mercaptosilanes, and often also to the need to The use of these silanes in the manufacture of inorganic deal with less than optimal processing conditions, both of filled rubbers is taught wherein they are deblocked by the which lead to higher costs. use of a deblocking agent during the manufacturing process. 0004 The prior art discloses acylthioalkyl silanes, such The manufacture of Such silanes is taught as well. as CHC(=O)S(CH), Si(OR) (M. G. Voronkov et al. in Inst. Org. Khim., Irkutsk, Russia) and DETAILED DESCRIPTION OF THE HOC(=O)CHCHC(=O)S(CH.).Si(OC.H.). (U.S. Pat. INVENTION No.3,922,436 to R. Bell et al.). Takeshita and Sugawara disclosed in Japanese Patent JP 63270751 A2 the use of Silane Structures compounds represented by the general formula 0009. The blocked mercaptosilanes can be represented by CH=C(CH,)C(=O)S(CH4), Si(OCH,), in tire tread the Formulae (1-2): compositions; but these compounds are not desirable because the unsaturation C.f3 to the carbonyl group of the (ROC(=O))-(G). Y-S-G-(SIXs), (1); and thioester has the undesirable potential to polymerize during I(X,Si), Gl-IY-IS-G-SiXs.l. (2) the compounding process or during storage. wherein 0005 Prior art by Yves Bomal and Olivier Durel in 0010 Y is a polyvalent species (Q) A(=E), preferably Australian Patent AU-A-10082/97 discloses the use in rub selected from the group consisting of —C(=NR)—: ber of silanes of the structure represented by RX-Si (Alk), (Ar), S(C=O) R where R" is phenyl or alkyl: X is halogen, alkoxy, cycloalkoxy, acyloxy, or OH: Alk is alkyl, Ar is aryl; R is alky, alkenyl, or aryl; n is 0 to 2; and m and p are each 0 or 1, but not both Zero. This prior art, however, stipulates that compositions of the structures of Formula (1P) must be used in conjunction with functional ized siloxanes. In addition, the prior art does not disclose or Suggest the use of compounds of Formula (1P) as latent US 2006/0183866 A1 Aug. 17, 2006 a “dithiocarbamate ester silane'); thiosulfonate ester, (any silane with this functional group is a silane'); thiosulfate ester, —O—S(=O)2S - (any silane with this functional group is the atom (A) attached to the unsaturated heteroatom (E) is a “thiosulfate ester silane'); thiosulfamate ester, ( N ) attached to the sulfur, which in turn is linked via a group G S(=O)S - (any silane with this functional group is a to the silicon atom; “thiosulfamate ester silane'); thiosulfinate ester, 0011 each R is chosen independently from hydrogen, —S(=O)S - (any silane with this functional group is a straight, cyclic, or branched alkyl that may or may not “thiosulfinate ester silane'); thiosulfate ester, —O—S contain unsaturation, alkenyl groups, aryl groups, and (=O)S (any silane with this functional group is a “thio aralkyl groups, with each R containing from 1 to 18 carbon sulfite ester silane'); thiosulfimate ester, ( N )S(=O)— atoms; S— (any silane with this functional group is a “thiosulfimate 0012 each G is independently a monovalent or polyva ester silane'); thiophosphate ester, P(=O)(O ), (S-) (any lent group derived by Substitution of alkyl, alkenyl, aryl, or silane with this functional group is a “thiophosphate ester aralkyl wherein G can contain from 1 to 18 carbon atoms, silane'); dithiophosphate ester, P(=O)(O )(S-), or with the proviso that G is not such that the silane would P(=S)(O—),(S ) (any silane with this functional group is contain an O.B-unsaturated carbonyl including a carbon a “dithiophosphate ester silane'); trithiophosphate ester, carbon double bond next to the thiocarbonyl group, and if G P(=O)(S ), or P(=S)(O )(S ), (any silane with this directly bonded to Y is univalent (i.e., if p=0), G can be a functional group is a “trithiophosphate ester silane'); hydrogen atom; tetrathiophosphate ester P(=S)(S-) (any silane with this functional group is a “tetrathiophosphate ester silane'); 0013 X is independently selected from the group con thiophosphamate ester, —P(=O)( N )(S-) (any silane sisting of Cl, Br, RO , RC(=O)C) , RC=NO , with this functional group is a “thiophosphamate ester RNO or RN —R, —(OSiR),(OSiR) wherein each silane'); dithiophosphamate ester, —P(=S)( N—)(S ) R and G is as above and at least one X is not —R; (any silane with this functional group is a “dithiophospha 0014 Q is oxygen,
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